WO2020243492A1 - Compositions thermoplastiques, procédés pour leur préparation, et articles correspondants - Google Patents

Compositions thermoplastiques, procédés pour leur préparation, et articles correspondants Download PDF

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WO2020243492A1
WO2020243492A1 PCT/US2020/035214 US2020035214W WO2020243492A1 WO 2020243492 A1 WO2020243492 A1 WO 2020243492A1 US 2020035214 W US2020035214 W US 2020035214W WO 2020243492 A1 WO2020243492 A1 WO 2020243492A1
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carbonate
siloxane
units
poly
bisphenol
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PCT/US2020/035214
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English (en)
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Laura Mely RAMIREZ
Tony Farrell
Paul Dean Sybert
Remco WIRTZ
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Sabic Global Technologies B.V.
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Priority to EP20737637.7A priority Critical patent/EP3976706A1/fr
Priority to US17/614,014 priority patent/US20220220312A1/en
Publication of WO2020243492A1 publication Critical patent/WO2020243492A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/10—Block- or graft-copolymers containing polysiloxane sequences
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y70/00—Materials specially adapted for additive manufacturing
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
    • C08L69/005—Polyester-carbonates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/10—Block or graft copolymers containing polysiloxane sequences
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

Definitions

  • thermoplastic compositions and in particular to thermoplastic compositions that can be used to make interior components for aircrafts, methods of manufacture, and uses thereof.
  • a thermoplastic composition comprises: 40 to 75 wt% of a poly(carbonate- siloxane-arylate); 5 to 45 wt% of a poly(carbonate-siloxane) present in an amount effective to provide 0.75 to 7 wt% of siloxane units; 10 to 40 wt% of a polycarbonate homopolymer; 5 to 15 wt% of an organophosphorus compound in an amount effective to provide 0.1 to 1 wt% of phosphorus; and optionally, 0.1 to 10 wt% of an additive composition, wherein each amount is based on the total weight of the poly(carbonate-siloxane-arylate), poly(carbonate-siloxane), polycarbonate homopolymer, flame retardant, and optional additive composition, which does not exceed 100%; and wherein the thermoplastic composition has a melt volume flow rate of greater than 6 cm 3 /10 min when measured in accordance with the ISO-1133-1 :2011 standard at 300°C under a load of 1.2 kg
  • thermoplastic composition A powder, filament, or composite comprising the thermoplastic composition is also disclosed.
  • thermoplastic composition is selected from a molded article, a thermoformed article, an extruded film, an extruded sheet, a foamed article, a layer of a multi-layer article, a substrate for a coated article, and a substrate for a metallized article, preferably wherein the article is an aircraft interior component.
  • a method of manufacture of an article comprises additively manufacturing the article using a powder or filament comprising the thermoplastic composition.
  • thermoplastic compositions having balanced flow, impact properties, smoke, and heat release can be obtained by combining a poly(carbonate-siloxane-arylate) with a poly(carbonate-siloxane), a linear or branched polycarbonate homopolymer, and certain phosphorus-containing flame retardants.
  • a combination of a poly(carbonate-siloxane-arylate) and a phosphorus-containing flame retardant can meet the smoke and heat release requirements for aircraft applications, but can have less than desirable impact properties.
  • Adding a linear or branched polycarbonate homopolymer to the combination maintains the heat and smoke properties, but the impact resistance is still low. Further adding a small amount of a poly(carbonate-siloxane) results in compositions with an unexpected combination of high impact resistance, good ductility, good flow, and excellent flame retardance.
  • thermoplastic compositions can advantageously be used to make aircraft components, in particular, thin wall aircraft components meeting or exceeding governmental and aircraft manufacturer flame safety requirements.
  • thermoplastic compositions are described in more detail below.
  • the poly(carbonate-siloxane-arylate) comprises repeating aromatic carbonate units, siloxane units, and aromatic ester (arylate) units.
  • the aromatic carbonate units are of formula (1):
  • the aromatic carbonate units can be derived from a dihydroxy aromatic compound such as a bisphenol of formula (2) or a diphenol of formula (3):
  • Ci- 10 hydrocarbyl group such as a Ci- 10 alkyl, a C 6-10 aryl, and n is 0 to 4.
  • R a and R b are each independently C 1-3 alkyl or C 1-3 alkoxy, p and q are each independently 0 to 1, and X a is a single bond, -O-, - S(O)-, -S(0) 2 -, -C(O)-, a Ci- 11 alkylidene of formula -C(R c )(R d ) - wherein R c and R d are each independently hydrogen or Ci- 10 alkyl, each R h is independently a C 1-3 alkyl, and n is 0 to 1.
  • dihydroxy compounds (2) that can be used are described, for example, in WO 2013/175448 Al, US 2014/0295363, and WO 2014/072923.
  • Specific dihydroxy compounds include 2,2-bis(4-hydroxyphenyl) propane (“bisphenol A” or “BPA”), 3,3-bis(4-hydroxyphenyl) phthalimidine, 2-phenyl-3,3’-bis(4-hydroxyphenyl) phthalimidine (also known as N-phenyl phenolphthalein bisphenol,“PPPBP”, or 3,3-bis(4- hydroxyphenyl)-2-phenylisoindolin-l-one), l,l-bis(4-hydroxy-3-methylphenyl)cyclohexane, and l, l-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane (isophorone bisphenol).
  • BPA 2,2-bis(4-hydroxyphenyl) propane
  • BPA 3,3-bis(4-hydroxyphenyl) phthal
  • diphenol compounds (3) included resorcinol, substituted resorcinol compounds such as 5- methyl resorcinol, 5-ethyl resorcinol, 5-propyl resorcinol, 5-butyl resorcinol, 5-t-butyl resorcinol, 5-phenyl resorcinol, 5-cumyl resorcinol, or the like; catechol; hydroquinone; substituted hydroquinones such as 2-methyl hydroquinone, 2-ethyl hydroquinone, 2-propyl hydroquinone, 2-butyl hydroquinone, 2-t-butyl hydroquinone, 2-phenyl hydroquinone, 2- cumyl hydroquinone, 2,3,5,6-tetramethyl hydroquinone, 2,3,5,6-tetra-t-butyl hydroquinone, or the like.
  • a combination of different diphenol compounds can be used.
  • the aromatic carbonate units are bisphenol A carbonate units having the formula (2a):
  • the poly(carbonate-siloxane-arylate) further comprises aromatic ester (arylate) units, i.e., ester units based on an aromatic dicarboxylic acid repeating ester units of formula (4)
  • D is a divalent group derived from a dihydroxy compound, and can be, for example, a Ce-20 alicyclic group or a Ce-20 aromatic group; and T is a divalent Ce-20 arylene group.
  • D is derived from a dihydroxy aromatic compound of formula (2), formula (3) or a combination thereof.
  • the D and T groups are desirably minimally substituted with hydrocarbon-containing substituents such as alkyl, alkoxy, or alkylene substituents.
  • less than 5 mol%, preferably less than or equal to 2 mol%, and still more preferably less than or equal to 1 mol% of the combined number of moles of D and T groups are substituted with hydrocarbon-containing substituents such as alkyl, alkoxy, or alkylene substituents.
  • aromatic dicarboxylic acids from which the T group in the ester unit of formula (4) is derived include isophthalic or terephthalic acid, l,2-di(p- carboxy phenyl) ethane, 4,4'-dicarboxydiphenyl ether, 4,4'-bisbenzoic acid, and combinations comprising at least one of the foregoing acids. Acids containing fused rings can also be present, such as in 1,4-, 1,5-, or 2,6-naphthalenedicarboxylic acids.
  • Specific dicarboxylic acids are terephthalic acid, isophthalic acid, naphthalene dicarboxylic acid, cyclohexane dicarboxylic acid, or combinations thereof.
  • a specific dicarboxylic acid comprises a combination of isophthalic acid and terephthalic acid wherein the weight ratio of isophthalic acid to terephthalic acid is 99: 1 to 1 :99.
  • the aromatic ester units are derived from the reaction product of one equivalent of an isophthalic acid derivative and/or terephthalic acid derivative.
  • the aromatic ester units are of formula (4a) or (4b):
  • each R f is independently a Ci-io hydrocarbyl group such as a Ci-io alkyl, a C6-10 aryl, u is 0 to 4, preferably 0, and m is greater than or equal to 4.
  • m is 4 to 100, 4 to 50, preferably 5 to 30, more preferably 5 to 25, and still more preferably 10 to 20.
  • the molar ratio of isophthalate to terephthalate can also be 0.25 : 1 to 4.0: 1.
  • Preferred aromatic ester units are isophthalate-terephthalate-resorcinol ester units, isophthalate-terephthalate-bisphenol A ester units, or a combination of these, which can be referred to respectively as
  • poly(isophthalate-terephthalate-resorcinol) ester units poly(isophthalate-terephthalate-bisphenol-A) ester units, and poly[(isophthalate-terephthalate-resorcinol) ester-co- (isophthalate-terephthalate-bisphenol-A)] ester units.
  • aromatic carbonate units and the aromatic ester units are present as blocks of formula (5):
  • each R 1 is independently a C6-30 arylene group, and n is greater than or equal to one, for example 3 to 50, preferably from 5 to 25, and more preferably from 5 to 20.
  • m is 5 to 75 and n is 3 to 50, or m is 10 to 25 and n is 5 to 20, and the molar ratio of isophthalate units to terephthalate units is 80:20 to 20:80.
  • the preferred carbonate units are bisphenol A carbonate units, optionally together with resorcinol carbonate units, and the aromatic ester units are poly(isophthalate-terephthalate-resorcinol) ester units, poly(isophthalate-terephthalate- bisphenol-A) ester units, and poly[(isophthalate-terephthalate-resorcinol) ester-co- (isophthalate-terephthalate-bisphenol-A)] ester units.
  • the carbonate and aromatic ester units are present as a poly(isophthalate-terephthalate-resorcinol ester)-co- (resorcinol carbonate)-co-(bisphenol-A carbonate) segment.
  • the carbonate and aromatic ester units desirably comprise a minimum amount of saturated hydrocarbon present in the form of substituents or structural groups such as bridging groups or other connective groups. In an aspect, less than or equal to 25 mol%, preferably less than or equal to 15 mol%, and still more preferably less than or equal to 10 mol% of the combined aromatic ester units and carbonate units comprise alkyl, alkoxy, or alkylene groups.
  • the aromatic ester units and the carbonate units are not substituted with non-aromatic hydrocarbon-containing substituents such as alkyl, alkoxy, or alkylene substituents.
  • siloxane units (also referred to as polysiloxane blocks) are of formula (6):
  • each R is independently a Ci-13 monovalent organic group.
  • R can be a C 1-13 alkyl, Ci-13 alkoxy, C2-13 alkenyl, C2-13 alkenyloxy, C3-6 cycloalkyl, C3-6 cycloalkoxy, Ce- aryl, C6-10 aryloxy, C7-13 arylalkylene, C7-13 arylalkylenoxy, C7-13 alkylarylene, or C7-13 alkylarylenoxy.
  • Combinations of the foregoing R groups can be used in the same copolymer.
  • R is a C1-3 alkyl, C1-3 alkoxy, C3-6 cycloalkyl, C3-6 cycloalkoxy, C6-14 aryl, C6-10 aryloxy, C7 arylalkylene, C7 arylalkylenoxy, C7 alkylarylene, or C7 alkylarylenoxy.
  • R is methyl, or phenyl.
  • E in formula (6) can vary widely depending on the type and relative amount of each component in the thermoplastic compositions, the desired properties of the composition, and like considerations. Generally, E has an average value of 2 to 125, 5 to 80, or 10 to 100. Preferably, E has an average value of 5 to 20 or 5 to 15, and E can also have an average value of 20 to 80, or 30 to 70, preferably 30 to 50 or 40 to 50. As used herein, the average value of E means number average value of E.
  • siloxane units are of formula (7):
  • E is as defined in formula (6); each R can be the same or different and is as defined above in the context of formula (6); and Ar can be the same or different and is a substituted or unsubstituted C 6-30 arylene, wherein the bonds are directly connected to an aromatic moiety.
  • Ar groups in formula (7) can be derived from a C6-30 dihydroxyarylene compound, for example a dihydroxy compound of formula (2).
  • Exemplary dihydroxyarylene compounds are l,l-bis(4-hydroxyphenyl) methane, l,l-bis(4-hydroxyphenyl) ethane, 2,2-bis(4- hydroxyphenyl) propane, 2,2-bis(4-hydroxyphenyl) butane, 2,2-bis(4-hydroxyphenyl) octane, l,l-bis(4-hydroxyphenyl) propane, l,l-bis(4-hydroxyphenyl) n-butane, 2,2-bis(4-hydroxy-l- methylphenyl) propane, l,l-bis(4-hydroxyphenyl) cyclohexane, bis(4-hydroxyphenyl sulfide), and l,l-bis(4-hydroxy-t-butylphenyl) propane.
  • Combinations comprising at least one of the foregoing dihydroxy compounds can also be used.
  • siloxane units of formula (7) include those of the formulas (7a) and (7b):
  • siloxane units are of formula (8):
  • R and E are as described in formula (6), and each R 5 is independently a divalent Ci- C30 organic group, and wherein the polymerized polysiloxane unit is the reaction residue of its corresponding dihydroxy compound.
  • the siloxane units are of formula (9):
  • R 6 in formula (9) is a divalent C2-8 aliphatic.
  • Each M in formula (9) can be the same or different, and can be cyano, nitro, a Ci-8 alkylthio, Ci-8 alkyl, Ci-8 alkoxy, C2-8 alkenyl, C2-8 alkenyloxy, C3-8 cycloalkyl, C3-8 cycloalkoxy, C6-10 aryl, C6-10 aryloxy, C7-12 aralkyl, C7-12 arylalkylenoxy, C7-12 alkylarylene, or C7-12 alkylarylenoxy, wherein each n is independently 0, 1, 2, 3, or 4.
  • M is an alkyl such as methyl, ethyl, or propyl, an alkoxy such as methoxy, ethoxy, or propoxy, or an aryl such as phenyl, or tolyl;
  • R 6 is a dimethylene, trimethylene or tetramethylene; and
  • R is a Ci- 8 alkyl, cyanoalkyl, or aryl such as phenyl, or tolyl.
  • R is methyl, or a combination of methyl and phenyl.
  • R is methyl, M is methoxy, n is one, and R 6 is a divalent C1-3 aliphatic group.
  • E has an average value of 5 to 20 or 5 to 15.
  • Blocks of formula (9) can be derived from the corresponding dihydroxy polydiorganosiloxane, which in turn can be prepared effecting a platinum-catalyzed addition between the siloxane hydride and an aliphatically unsaturated monohydric phenol such as eugenol, 2-alkylphenol, 4-allyl-2-methylphenol, 4-allyl-2-phenylphenol, 4-allyl-2-t- butoxyphenol, 4-phenyl-2-phenylphenol, 2-methyl-4-propylphenol, 2-allyl-4,6- dimethylphenol, 2-allyl-6-m ethoxy -4-methylphenol and 2-allyl-4,6-dimethylphenol.
  • an aliphatically unsaturated monohydric phenol such as eugenol, 2-alkylphenol, 4-allyl-2-methylphenol, 4-allyl-2-phenylphenol, 4-allyl-2-t- butoxyphenol, 4-phenyl-2-phenylphenol, 2-methyl-4-propylphenol, 2-ally
  • the polysiloxane units can then be endcapped, with resorcinol or bisphenol A, for example, by the synthetic procedures of European Patent Application Publication No. 0 524 731 A1 of Hoover.
  • the endcapped polysiloxane can the form an ester-linked structure with a carboxylic acid derivative during formation of the poly(carbonate-siloxane-arylate), or a carbonate- linked structure by copolymerization with a carbonate precursor such as chloroformate, or a combination of such structures.
  • the poly(carbonate-siloxane-arylate) can be manufactured by different methods such as solution polymerization, interfacial polymerization, and melt polymerization as is known in the art.
  • the poly(carbonate-siloxane-arylate) is provided by the reaction of a diacid derivative, a difunctional polysiloxane, a dihydroxy aromatic compound, and, a carbonyl source, in a biphasic medium comprising an immiscible organic phase and aqueous phase.
  • the arylate unit is formed by reacting a dihydroxy aromatic compound and a dicarboxylic acid dichloride in a biphasic medium in the presence of a base.
  • the order and timing of addition of these components to the polymerization reaction can be varied to provide a poly(carbonate-siloxane-arylate) having different distributions of the polysiloxane in the polymer backbone.
  • All types of end groups are contemplated as being useful, e.g., phenol, cyanophenol, or para-cumyl phenol, provided that such end groups do not significantly affect desired properties of the polycarbonate copolymer compositions.
  • the poly(carbonate-siloxane-arylate) comprises 0.2 to 49.8 mol%, 1 to 40 mol%, or 1 to 20 mol% of carbonate units such as bisphenol-A carbonate units, 50 to 99.6 mol% or 50 to 95 mol% of aromatic ester units (4a) or (4b), and an amount of polysiloxane units (7a), (7b), (9a), (9b), (9c), or a combination comprising at least one of the foregoing, specifically (9a), in an amount effective to provide 0.2 to 10 wt%, preferably 0.2 to 6 wt%, more preferably 0.2 to 5 wt%, and still more preferably 0.25 to 2 wt% siloxane units, each based on the total copolymer.
  • the poly(carbonate-siloxane-arylate) can comprise 1 to 20 mol% of bisphenol-A carbonate units, 60 to 90 mole% of aromatic ester units (4b), and an amount of polysiloxane units (9a), (9b), (9c) or a combination comprising at least one of the foregoing (specifically of formula 9a) effective to provide 0.2 to 5 wt% of siloxane units, each based on the total copolymer.
  • thermoplastic compositions contain 40 to 75 wt% or 60 to 65 wt% of the poly(carbonate-siloxane-arylate), based on the total weight of the thermoplastic compositions.
  • compositions further comprise a poly(carbonate-siloxane).
  • the poly(carbonate-siloxane) can comprise carbonate units and siloxane units as described herein in the context of
  • poly(carbonate-siloxane) can be free of aromatic ester units.
  • the poly(carbonate- siloxane) comprises carbonate units derived from bisphenol A, and repeating siloxane units (7a), (7b), (9a), (9b), (9c), or a combination thereof (preferably of formula 9a), wherein E has an average value of 10 to 100, preferably 20 to 80, or 30 to 70, more preferably 30 to 50 or 40 to 50.
  • the poly(carbonate-siloxane) can have a siloxane content of 5 to 45 wt%, 5 to 30 wt%, or 10 to 30 wt%, preferably 15 to 25 wt%, more preferably 17 to 23 wt%, each based on the total weight of the poly(carbonate-siloxane).
  • siloxane content refers to the content of siloxane units based on the total weight of the poly(carbonate-siloxane).
  • the poly(carbonate-siloxane) can have an Mw of 28,000 to 32,000 Dalton (Da), preferably 29,000 to 31,000 Da as measured by gel permeation chromatography using a crosslinked styrene-divinyl benzene column, at a sample
  • the poly(carbonate-siloxane) can be present in an amount effective to provide 0.75 to 7 wt%, preferably 1 to 5 wt% or 1 to 4 wt%, and more preferably 1 to 3 wt% siloxane units, based on the total weight of the thermoplastic compositions.
  • the poly(carbonate-siloxane) is present in the thermoplastic compositions in an amount of 5 to 45 wt%, preferably 5 to 25 wt%, and more preferably 5 to 15 wt%, based on the total weight of the thermoplastic compositions.
  • the linear and the branched polycarbonate homopolymers can comprise carbonate units as described herein in formula (1) or are derived from bisphenols of formula (2) or (3).
  • Preferably the linear and the branched polycarbonate homopolymers have bisphenol A carbonate units of formula (2a).
  • the linear polycarbonate homopolymer can have a weight average molecular weight of 15,000 to 20,000 Da or 16,000 to 19,000 Da as measured by gel permeation chromatography (GPC), using a crosslinked styrene-divinylbenzene column and calibrated to bisphenol A homopolycarbonate references.
  • the linear polycarbonate homopolymer can have endgroups derived from an end-capping agent such as phenol, p-cumylphenol, or a combination comprising at least one of the foregoing.
  • branched polycarbonate a particular type of branching agent is used. These branched polycarbonate materials have statistically more than two end groups.
  • the branching agent is added in an amount (relative to the bisphenol monomer) that is sufficient to achieve the desired branching content, that is, more than two end groups.
  • the molecular weight of the polymer may become very high upon addition of the branching agent, and to avoid excess viscosity during polymerization, an increased amount of a chain stopper agent can be used, relative to the amount used when the particular branching agent is not present.
  • the amount of chain stopper used is generally above 5 mole percent and less than 20 mole percent compared to the bisphenol monomer.
  • branching agents include aromatic triacyl halides, for example triacyl chlorides of formula (10)
  • Z is a halogen, C 1-3 alkyl, C 1-3 alkoxy, C 7-12 arylalkylene, C 7-12 alkylarylene, or nitro, and z is 0 to 3; a tri-substituted phenol of formula (11)
  • T is a Ci- 20 alkyl, Ci- 20 alkoxy, C 7-12 arylalkyl, or C 7-12 alkylaryl
  • Y is a halogen, C 1-3 alkyl, C 1-3 alkoxy, C 7-12 arylalkyl, C 7-12 alkylaryl, or nitro
  • s is 0 to 4; or a compound of formula (12) (isatin-bis-phenol)
  • TMTC trimellitic trichloride
  • THPE tris-p-hydroxyphenylethane
  • isatin-bis- phenol examples include trimellitic trichloride (TMTC), tris-p-hydroxyphenylethane (THPE), and isatin-bis- phenol.
  • polycarbonate will depend on a number of considerations, for example the type of R 1 groups in the carbonate units (1), the amount of chain stopper, e.g., cyanophenol, and the desired molecular weight of the polycarbonate.
  • the amount of branching agent is effective to provide 0.1 to 10 branching units per 100 unbranched carbonate units (1) (R 1 units), specifically 0.5 to 8 branching units per 100 R 1 units, and more specifically 0.75 to 5 branching units per 100 R 1 units.
  • R 1 units unbranched carbonate units
  • branching agents can be used.
  • the branching agents can be added at a level of 0.05 to 2.0 wt%.
  • the branched polycarbonate comprises units (1) or (2a) as described above; greater than or equal to 3 mole%, e.g., 3 to 10 mole%, based on the total moles of the polycarbonate, of moieties derived from a branching agent; and end-capping groups derived from an end-capping agent having a pKa between 8.3 and 11.
  • the branching agent can comprise trimellitic trichloride, l,l,l-tris(4-hydroxyphenyl)ethane (THPE) or a combination of trimellitic trichloride and l,l, l-tris(4-hydroxyphenyl)ethane, and the end capping agent is phenol or a phenol containing a substituent of cyano group, aliphatic groups, olefmic groups, aromatic groups, ester groups, ether groups, or a combination comprising at least one of the foregoing.
  • THPE trimellitic trichloride
  • the end capping agent is phenol or a phenol containing a substituent of cyano group, aliphatic groups, olefmic groups, aromatic groups, ester groups, ether groups, or a combination comprising at least one of the foregoing.
  • the end-capping agent is phenol, p-t- butylphenol, p-methoxyphenol, p-cyanophenol, p-cumylphenol, or a combination comprising at least one of the foregoing.
  • the branched polycarbonate comprises bisphenol A carbonate units, 3 to 10 mol%, based on the total moles of the branched polycarbonate, of a moiety derived from l,l,l-tris(4-hydroxyphenyl)ethane, and end-capping groups derived from p-cyanophenol.
  • the branched polycarbonate has a molecular weight of between 28,000 and 40,000 Da or 30,000 to 35,000 Da as measured by gel permeation chromatography (GPC), using a crosslinked styrene-divinylbenzene column and calibrated to bisphenol A
  • thermoplastic compositions can contain 10 to 40 wt%, 10 to 30 wt%, or 15 to 25 wt% of the linear or the branched polycarbonate homopolymer or a combination thereof.
  • the organophosphorus flame retardant in the thermoplastic compositions has a structure represented by formula (13):
  • R 16 , R 17 , R 18 , and R 19 are each independently Ci- 8 alkyl, C5-6 cycloalkyl, Ce-20 aryl, or C7-12 arylalkylene, each optionally substituted by Ci-12 alkyl, specifically by C1-4 alkyl, and X is a mono- or poly-nuclear aromatic C6-30 moiety or a linear or branched C2-30 aliphatic radical, which can be OH-substituted and can contain up to 8 ether bonds, provided that at least one of R 16 , R 17 , R 18 , R 19 , and X is an aromatic group.
  • R 18 , and R 19 are each independently C 1-4 alkyl, naphthyl, phenyl(Ci- 4 alkylene), or aryl groups optionally substituted by C 1-4 alkyl. Specific aryl moieties are cresyl, phenyl, xylenyl, propylphenyl, or butylphenyl.
  • X in formula (13) is a mono- or poly nuclear aromatic C6-30 moiety derived from a diphenol.
  • n is each independently 0 or 1; in some embodiments n is equal to 1.
  • q is from 0.5 to 30, from 0.8 to 15, from 1 to 5, or from 1 to 2.
  • X can be represented by the following divalent groups (14) or a combination thereof,
  • each of R 16 , R 17 , R 18 , and R 19 can be aromatic, i.e., phenyl, n is 1, and q is 1-5, specifically 1-2, and X is of formula (14).
  • flame retardants include an oligomeric phosphate ester having a phosphorus content of 10.7 wt%, a specific gravity of 1.3, and a melting point of 101-108°C, available as Sol -DP from FYROLFLEX and a phosphate ester of formula (14b)
  • FP 800 having a phosphorus content 9.5 wt%, available as FP 800 from CEL-SPAN.
  • the organophosphorus compound is present in an amount effective to provide 0.1 to 1 wt% of phosphorus, based on the total weight of the thermoplastic compositions. Accordingly, depending on the particular organophosphorus compound used, the organophosphorus compound is present in an amount effective to provide 0.1 to 1 wt% of phosphorus, based on the total weight of the thermoplastic compositions. Accordingly, depending on the particular organophosphorus compound used, the organophosphorus compound used, the
  • thermoplastic compositions can comprise from 2 to 15 wt%, or 2 to 10 wt%, or 5 to 8 wt%, or 6 to 8 wt% of the organophosphorus flame retardant, each based on the total weight of the compositions.
  • the thermoplastic compositions can be essentially halogen-free.
  • Essentially halogen-free is defined as having a chlorine or bromine content of less than or equal to 100 parts per million by weight (ppm), less than or equal to 75 ppm, or less than or equal to 50 ppm, based on the total parts by weight of the composition, excluding any filler or colorants.
  • Essentially halogen-free also means that the total amount of chlorine and bromine is less than or equal to 200 ppm, less than or equal to 150 ppm, or less than or equal to 100 ppm, based on the total parts by weight of the composition, excluding any filler.
  • the thermoplastic compositions further contain a mineral filler, glass, carbon, or a combination comprising at least one of the foregoing.
  • mineral fillers include aluminum silicate, calcium carbonate, calcium sulfate dihydrate, calcium sulfate hemihydrate, calcinated clay, calcium silicate, clay, crushed quartz, diatomaceous earth, fly ash, kaolin, limestone, mica, silicates, talc, titanium dioxide, wollastonite, zirconium oxide, and zirconium silicate.
  • the mineral filler, glass, carbon, or a combination comprising at least one of the foregoing can be present in an amount of 5 to 45 wt% based on the total weight of the thermoplastic compositions.
  • the thermoplastic compositions can further include various additives ordinarily incorporated into flame retardant compositions having low smoke density and low heat release, with the proviso that the additive(s) are selected so as to not adversely affect the desired properties of the thermoplastic composition significantly, in particular low smoke density and low heat release.
  • additives can be mixed at a suitable time during the mixing of the components for forming the composition.
  • Exemplary additives include antioxidants, heat stabilizers, light stabilizers, ultraviolet (UV) light stabilizers, plasticizers, lubricants, mold release agents, antistatic agents, colorants such as such as titanium dioxide, carbon black, and organic dyes, surface effect additives, radiation stabilizers, additional flame retardants, and anti-drip agents.
  • a combination of additives can be used.
  • the additives are used in the amounts generally known to be effective.
  • the total amount of additives can be 0.01 to 5 wt% based on the total weight of the thermoplastic compositions.
  • the thermoplastic compositions comprise no more than 5 wt% based on the weight of the compositions of a processing aid, a heat stabilizer, anti-drip agent, an antioxidant, a colorant, or a combination comprising at least one of the foregoing.
  • thermoplastic compositions can have a combination of desired properties. As discussed herein, the thermoplastic compositions are formulated to meet strict
  • the thermoplastic composition can have an OSU integrated 2- minute heat release test value of less than 65 kW-min/m 2 and a peak heat release rate of less than 65 kW/m 2 as measured using the method of FAR F25.4, in accordance with Federal Aviation Regulation FAR 25.853 (d), on parts with a thickness of 1.5, 2, or 3 mm.
  • thermoplastic composition can further have a flame time of less than 15 seconds, a burn length of less than 6 inches, and a drip extinguishing time of less than 5 seconds, each measured using the method of FAR F25.5, in accordance FAR 25.853(a) at a thickness of 1.5, 2, or 3 mm.
  • the thermoplastic compositions can further have excellent impact properties, including impact resistance, or ductility, or both.
  • the compositions can have a notched Izod impact resistance of greater than 30 kJ/m 2 determined in accordance with ISO 180:2000 on 4 mm ISO bars at 23°C, with a 5.5 J hammer.
  • the compositions can also have a notched Izod impact resistance of greater than 700 J/m 2 and a ductility of greater than 80% or 100%, each measured on notched 3.2 mm bars at 23°C, in accordance with the ASTM-D256-10 (2016) standard.
  • compositions can have a ductility in multiaxial impact of 100%, performed on notched discs having a thickness of 3.2 mm and a diameter of 100 mm at 23°C, in accordance with the ISO-6603-2:2000 standard at an impact speed of 4.4 m/s.
  • the same or similar values can be obtained in articles having a wide range of thicknesses, for example from 0.1 to 10 mm, but particularly at 0.5 to 5 mm.
  • the compositions can also have a ductility in multiaxial impact of 100% at lower temperatures, such as +10°C, 0°C, -10°C, -20°C, or -30 °C.
  • the compositions can further have good melt viscosities, which aids processing.
  • the thermoplastic composition can have a melt volume flow rate (MVFR) of greater than 6 cc/10 min (cubic centimeter per 10 minutes), or 6 to 20 cc/10 min, when measured in accordance with the ISO-1133-1 :2011 standard at 300°C under a load of 1.2 kg with a residence time of 300 seconds.
  • MVFR melt volume flow rate
  • melt viscosity is a measurement of the rheological characteristics of a composition at temperatures and shear conditions common to processing equipment. A lower value for melt viscosity indicates that the composition flows more easily.
  • the thermoplastic compositions as disclosed herein can have a melt viscosity of 200 to 350 Pascal-second (Pa- s), measured in accordance with ISO 11443:2014 at a temperature of 280°C under a shear rate of 1500 per second (s 1 ).
  • the thermoplastic compositions can also have a melt viscosity of 150 to 300 Pa-s, measured in accordance with ASTM D3835-16 at a temperature of 300°C under a shear rate of 1500 s 1 .
  • thermoplastic compositions can vary.
  • the polymers are combined with any additives (e.g., a mold release agent) such as in a screw-type extruder.
  • the polymers any additives can be combined in any order, and in form, for example, powder, granular, filamentous, as a masterbatch, and the like.
  • Transparent compositions can be produced by manipulation of the process used to manufacture the thermoplastic composition. One example of such a process to produce transparent thermoplastic compositions is described in U.S. Patent No. 7,767,738, incorporated herein by reference in its entirety.
  • the thermoplastic compositions can be foamed, extruded into a sheet, or optionally pelletized.
  • thermoplastic composition using frothing or physical or chemical blowing agents
  • the pellets can be used for molding into articles, foaming, or they can be used in forming a sheet of the flame-retardant thermoplastic composition.
  • the composition can be extruded (or co-extruded with a coating or other layer) in the form of a sheet and/or can be processed through calendaring rolls to form the desired sheet.
  • thermoplastic compositions can also be used to make powders, filaments, or composites.
  • the composites can also include a fibrous material such as glass, carbon, basalt in a format such as woven fibers, non-woven fibers, or uni-directional long fiber tapes.
  • the weight ratio of the thermoplastic composition relative to the fibrous material can be 10: 1 to 1 : 1.
  • thermoplastic compositions can be molded into useful shaped articles by a variety of means such as injection molding, extrusion, rotational molding, blow molding, and thermoforming to form articles.
  • the thermoplastic compositions can be used to form a foamed article, a molded article, a thermoformed article, an extruded film, an extruded sheet, a layer of a multi-layer article, e.g., a cap-layer, a substrate for a coated article, or a substrate for a metallized article.
  • These values can be obtained in articles having a wide range of thicknesses, for example from 0.1 to 10 mm, or 0.5 to 5 mm.
  • the articles can also be additively formed using a powder or filament comprising the thermoplastic compositions disclosed herein.
  • thermoplastic compositions are particularly useful in aircraft, for example a variety of aircraft compartment interior applications.
  • the articles can be interior components for aircraft, including access panels, access doors, air flow regulators baggage storage doors, display panels, display units, door handles, door pulls, enclosures for electronic devices, food carts, food trays, grilles, handles, magazine racks, seat components, partitions, refrigerator doors, seat backs, side walls, tray tables, trim panels, ceiling paneling, flaps, boxes, hoods, louvers, insulation material and the body shell in interiors, side walls, front walls/end walls, partitions, room dividers, interior doors, interior lining of the front- /end-wall doors and external doors, luggage overhead luggage racks, vertical luggage rack, luggage container, luggage compartments, windows, window frames, kitchen interiors, surfaces or a component assembly comprising at least one of the foregoing, and the like.
  • thermoplastic compositions can be formed (e.g., molded) into sheets that can be used for any of the above-mentioned components. It is generally noted that the overall size, shape, thickness, optical properties, and the like of the thermoplastic sheet can vary depending upon the desired application.
  • thermoplastic compositions having balanced flow, impact resistance, and OSU heat release are further illustrated by the following non-limiting examples.
  • HDT Heat distortion temperatures
  • ISO notched Izod impact measurements were performed on notched 10 mm x 4 mm thick ISO bars at 23°C, in accordance with the ISO-180:2000 standard with a 5.5 J hammer. Ductility is expressed as a percentage of the bars showing ductile failure.
  • Multi-axial impact (MAI) measurements were performed on notched discs having a thickness of 3.2 mm and a diameter of 100 mm at 23 °C, in accordance with the ISO- 6603-2:2000 standard at an impact speed of 4.4 m/s. Ductility is expressed as a percentage of the discs showing ductile failure.
  • ASTM notched Izod impact measurements were performed on notched 3.2 mm-thick bars at 0 or 23°C, in accordance with the ASTM-D256- 10 (2016) standard. Ductility is expressed as a percentage of the bars showing ductile failure.
  • MVFR Melt volume flow rate
  • MV Melt viscosity
  • Vicat softening temperatures were measured on 4 mm ISO bars in accordance with the ISO-306:2013 standard at a load of 10 N and a speed of 50°/hr (A50) or a load of 50 N and a speed of 120°C/hr (B120), respectively.
  • the spiral flow (SF) length was measured under a melt temperature of 330°C, a mold temperature of 100°C, and an injection pressure of 1000, 1600, or 2200 bar.
  • the resulting molded parts had a thickness of 3 mm or 1.5 mm.
  • OSU Ohio State University
  • two minute and peak heat release were measured on 15.2 x 15.2 cm x 3 mm test parts in accordance with FAR 25.853(a), Appendix F, part IV.
  • the samples were placed vertically in a calorimeter, exposed to a radiant panel and pilot flames. Results are shown as a pass if the two-minute total integrated heat release value is below or equal to 65 kW-min/m 2 (kilowatt minute per square meter) and the peak heat release is below or equal to 65 kW/m 2 (kilowatt per square meter) in the 5 minute duration of the test.
  • Smoke density was performed according to FAR 25.853(d), Appendix F, Part V on plaques of 76 x 76 mm with a thickness of 2 mm each.
  • the test part was placed vertically in a smoke density NBS chamber and exposed to a radiant furnace and pilot flames. The following parameters were measured: Optical smoke density (DS) in 1.5 minutes, DS in 4 minutes and the maximum smoke density (DS-4) that occurs in the first 4 minutes of the test. In order to pass the smoke density test, the three samples must show an average of less than or equal to 200.
  • compositions Example5 and Ex6
  • comparative compositions CExl to CEx4
  • the formulations and the results are shown in Table 2.
  • the hyphens indicate not measured or not measurable.
  • a thermoplastic composition comprising: 40 to 75 wt% of a poly(carbonate-siloxane-arylate); 5 to 45 wt% of a poly(carbonate-siloxane) present in an amount effective to provide 0.75 to 7 wt% of siloxane units; 10 to 40 wt% of a polycarbonate homopolymer; 5 to 15 wt% of an organophosphorus compound in an amount effective to provide 0.1 to 1 wt% of phosphorus; and optionally, 0.1 to 10 wt% of an additive
  • composition wherein each amount is based on the total weight of the poly(carbonate- siloxane-arylate), poly(carbonate-siloxane), polycarbonate homopolymer, flame retardant, and optional additive composition, which does not exceed 100%; and wherein the
  • thermoplastic composition has a melt volume flow rate of greater than 6 cm V l 0 min when measured in accordance with the ISO-1133-1 :2011 standard at 300°C under a load of 1.2 kg with a residence time of 300 seconds; and an article molded from the thermoplastic composition has a 2-minute integrated heat release rate of less than or equal to 65 kW-min/m 2 and a peak heat release rate of less than 65 kW/m 2 as measured using the method according to Part IV, OSU Heat Release of FAR/JAR 25.853, Amendment 25-116; and a notched Izod impact resistance of greater than 30 kJ/m 2 determined in accordance with ISO 180:2000 on notched 4 millimeter thick ISO bars at 23 °C, with a 5.5 J hammer; a notched Izod impact resistance of greater than 700 J/m 2 measured on notched 3.2 mm bars at 23°C, in accordance with the ASTM-D256-10 (2016) standard.
  • Aspect 2 The thermoplastic composition of Aspect 1, wherein the
  • poly(carbonate-siloxane-arylate) comprises: 0.2 to 10 wt% of siloxane units based on the total weight of the poly(carbonate-siloxane-arylate); 50 to 99.6 mol% arylate units, and 0.2 to 49.8 mol% carbonate units, each based on the sum of the moles of the siloxane units, the arylate units, and carbonate units in the poly(carbonate-siloxane-arylate); preferably wherein the arylate units are isophthalate-terephthalate-resorcinol ester units; the carbonate units are bisphenol A carbonate units, resorcinol carbonate units, or a combination thereof; and the siloxane units are polydimethylsiloxane units.
  • Aspect 3 The thermoplastic composition of any of the preceding Aspects, wherein the poly(carbonate-siloxane) comprises bisphenol A carbonate units and
  • the poly(carbonate-siloxane) has a siloxane content of 5 to 45 wt%, 5 to 30 wt%, or 10 to 30 wt%, preferably 15 to 25 wt%, more preferably 17 to 23 wt%, each based on the total weight of the poly(carbonate-siloxane).
  • the poly(carbonate-siloxane) has an Mw of 28,000 to 32,000 Dalton (Da), preferably 29,000 to 31,000 Da as measured by gel permeation chromatography using a crosslinked styrene-divinyl benzene column, at a sample concentration of 1 milligram per milliliter, and as calibrated with bisphenol A polycarbonate standards.
  • Aspect 4 The thermoplastic composition of any of the preceding Aspects, wherein the polycarbonate homopolymer comprises a linear bisphenol A polycarbonate homopolymer having a weight average molecular weight of 15,000 to 20,000 Dalton, as measured by gel permeation chromatography (GPC) using a crosslinked styrene- divinylbenzene column and calibrated to bisphenol A polycarbonate references.
  • GPC gel permeation chromatography
  • Aspect 5 The thermoplastic composition of any of the preceding Aspects, wherein the polycarbonate homopolymer comprises a branched polycarbonate comprising bisphenol A carbonate units and moieties derived from a branching agent comprising trimellitic acid, trimellitic anhydride, tris-phenol TC (l,3,5-tris((p- hydroxyphenyl)isopropyl)benzene), tris-phenol PA (4(4(1, l-bis(p-hydroxyphenyl)-ethyl) alpha, alpha-dimethyl benzyl)phenol), 4-chloroformyl phthalic anhydride, trimesic acid, benzophenone tetracarboxylic acid, or a combination thereof.
  • a branching agent comprising trimellitic acid, trimellitic anhydride, tris-phenol TC (l,3,5-tris((p- hydroxyphenyl)isopropyl)benzene), tris-phenol PA (4(4(1,
  • Aspect 6 The thermoplastic composition of Aspect 5, wherein the branched polycarbonate comprises bisphenol A carbonate units and 3 to 10 mol%, based on the total moles of the branched polycarbonate, of a moiety derived from l,l,l-tris(4- hydroxyphenyl)ethane; and optionally the branched polycarbonate has a weight average molecular weight of 28,000 to 40,000 Dalton, as measured by gel permeation
  • Aspect 7 The thermoplastic composition of any of the preceding Aspects, wherein the aromatic organophosphorus compound is of the formula
  • R 16 , R 17 , R 18 and R 19 are each independently Ci- 8 alkyl, C5-6 cycloalkyl, Ce-20 aryl, or C7-12 arylalkylene, each optionally substituted by Ci-12 alkyl, and X is a mono- or poly nuclear aromatic C6-30 moiety or a linear or branched C2-30 aliphatic moiety, each of which can be OH- substituted and can contain up to 8 ether bonds, provided that at least one of R 16 , R 17 , R 18 , R 19 , and X is aromatic, n is each independently 0 or 1, and q is from 0.5 to 30; preferably wherein each of R 16 , R 17 , R 18 , and R 19 is phenyl, X is of the formula
  • Aspect 8 The thermoplastic composition of any of preceding Aspects, wherein the aromatic organophosphorus compound is of the formula
  • thermoplastic composition of any of preceding Aspects comprising 60 to 65 wt% of the poly(carbonate-siloxane-arylate), wherein the
  • poly(carbonate-siloxane-arylate) comprises, based on the total weight of the poly(carbonate- siloxane-arylate) 0.2 to 10 wt% of siloxane units of the formula
  • E has an average value of 5 to 20, 50 to 99.6 mol% isophthalate-terephthalate- resorcinol ester units, and 0.2 to 49.8 mol% bisphenol A carbonate units; 5 to 15 wt% of the poly(carbonate-siloxane), wherein the poly(carbonate-siloxane) has a siloxane content of 15 to 25 wt% based on the total weight of the poly(carbonate-siloxane), and comprises bisphenol A carbonate units, and siloxane units of the formula
  • E has an average value of 20 to 80; and 15 to 25 wt% of the polycarbonate homopolymer, wherein the polycarbonate homopolymer comprises a branched polycarbonate comprising bisphenol A carbonate units and 3 to 10 mol%, based on the total moles of the branched polycarbonate, of a moiety derived from l,l, l-tris(4-hydroxyphenyl)ethane, and endcapping groups derived from p-cyanophenol; and the branched polycarbonate has a weight average molecular weight of 30,000 to 35,000 Dalton, as measured by gel permeation chromatography (GPC) using a crosslinked styrene-divinylbenzene column and calibrated to bisphenol A polycarbonate references; 5 to 8 wt% of the organophosphorus compound, wherein the organophosphorus compound has the formula
  • q is 1 to 5; and 0.1 to 3 wt% of the additive composition, wherein the additive composition comprises a mold release agent and a heat stabilizer.
  • Aspect 10 The thermoplastic composition of any of Aspects 1 to 8, comprising 60 to 65 wt% of the poly(carbonate-siloxane-arylate), wherein the poly(carbonate-siloxane-arylate) comprises, based on the total weight of the poly(carbonate- siloxane-arylate), 0.2 to 10 wt% of siloxane units of the formula
  • E has an average value of 5 to 20, 50 to 99.6 mol% isophthalate-terephthalate- resorcinol ester units, and 0.2 to 49.8 mol% bisphenol A carbonate units; 5 to 15 wt% of the poly(carbonate-siloxane), wherein the poly(carbonate-siloxane) has a siloxane content of 15 to 25 wt% based on the total weight of the poly(carbonate-siloxane), and comprises bisphenol A carbonate units, and siloxane units of the formula
  • E has an average value of 20 to 80; 15 to 25 wt% of the polycarbonate
  • the polycarbonate homopolymer comprises a linear bisphenol A polycarbonate homopolymer having a weight average molecular weight of 15,000 to 20,000 Dalton, as measured by gel permeation chromatography (GPC) using a crosslinked styrene- divinylbenzene column and calibrated to bisphenol A polycarbonate references; 5 to 8 wt% of the organophosphorus compound, based on the total weight of the thermoplastic composition wherein the organophosphorus compound has the formula
  • q is 1 to 5 to 5; and 0.1 to 3 wt% of the additive composition, wherein the additive composition comprises a mold release agent and a heat stabilizer.
  • thermoplastic composition of any of preceding Aspects further comprising a mineral filler, glass, carbon, or a combination comprising at least one of the foregoing; and optionally wherein the mineral filler, glass, carbon, or a combination comprising at least one of the foregoing are present in an amount of 5 to 45 wt%, based on the total weight of the thermoplastic composition.
  • Aspect 12 A powder, filament, or composite comprising the thermoplastic composition of any of preceding Aspects.
  • Aspect 13 A composite comprising the thermoplastic composition of any of Aspects 1 to 11, and a fibrous material comprising glass fiber, carbon fiber, basalt fiber; optionally wherein the fibrous material is a woven fiber, a non-woven fiber, or a uni directional fiber tape.
  • Aspect 14 An article comprising the composition of any of Aspects 1 to 13, selected from a molded article, a thermoformed article, an extruded film, an extruded sheet, a foamed article, a layer of a multi-layer article, a substrate for a coated article, and a substrate for a metallized article, preferably wherein the article is an aircraft interior component.
  • Aspect 15 A method of manufacture of an article, the method comprising additively manufacturing the article using a powder or filament comprising the thermoplastic compositions of any one of Aspects 1 to 11.

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Abstract

Une composition thermoplastique selon l'invention comprend : 40 à 75 % en poids d'un poly(carbonate-siloxane-arylate) ; 5 à 45 % en poids d'un poly(carbonate-siloxane) présent en une quantité efficace pour fournir de 0,75 à 7 % en poids de motifs siloxane ; 10 à 40 % en poids d'un homopolymère de polycarbonate ; 5 à 15 % en poids d'un composé organophosphoré en une quantité efficace pour fournir 0,1 à 1 % en poids de phosphore ; et facultativement, 0,1 à 10 % en poids d'une composition additive. La composition thermoplastique a un indice de fluidité à chaud supérieur à 6 cm3/10 min. Un article moulé à partir de la composition thermoplastique a un taux de dégagement de chaleur intégré à 2 minutes inférieur ou égal à 65 kW-min/m2 et un taux de dégagement de chaleur de pic inférieur à 65 kW/m2 et une résistance au choc Izod sur éprouvette entaillée supérieure à 30 kJ/m2 ou supérieure à 700 J/m2.
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